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Chapter 9 SIP
P-2304R-P1 Series User’s Guide
117
Each field is described in the following table.
Table 48 VoIP > SIP > SIP Settings > Advanced
LABEL DESCRIPTION
SIP Account This field displays the SIP account you see in this screen.
SIP Server
Settings
URL Type Select whether or not to include the SIP service domain name when the ZyXEL
Device sends the SIP number.
SIP - include the SIP service domain name
TEL - do not include the SIP service domain name
Expiration
Duration
Enter the number of seconds your SIP account is registered with the SIP register
server before it is deleted. The ZyXEL Device automatically tries to re-register
your SIP account when one-half of this time has passed. (The SIP register server
might have a different expiration.)
Register Re-send
timer
Enter the number of seconds the ZyXEL Device waits before it tries again to
register the SIP account, if the first try failed or if there is no response.
Session Expires Enter the number of seconds the conversation can last before the call is
automatically disconnected. Usually, when one-half of this time has passed, the
ZyXEL Device or the other party updates this timer to prevent this from happening.
Min-SE Enter the minimum number of seconds the ZyXEL Device accepts for a session
expiration time when it receives a request to start a SIP session. If the request has
a shorter time, the ZyXEL Device rejects it.
RTP Port Range
Start Port
End Port
Enter the listening port number(s) for RTP traffic, if your VoIP service provider
gave you this information. Otherwise, keep the default values.
To enter one port number, enter the port number in the Start Port and End Port
fields.
To enter a range of ports,
• enter the port number at the beginning of the range in the Start Port field
• enter the port number at the end of the range in the End Port field.
Voice
Compression
Select the type of voice coder/decoder (codec) that you want the ZyXEL Device to
use. G.711 provides higher voice quality but requires more bandwidth (64 kbps).
• G.711A is typically used in Europe.
• G.711u is typically used in North America and Japan.
In contrast, G.729 only requires 8 kbps.
The ZyXEL Device must use the same codec as the peer. When two SIP devices
start a SIP session, they must agree on a codec.
Primary
Compression
Type
Select the ZyXEL Device’s first choice for voice coder/decoder.
Secondary
Compression
Type
Select the ZyXEL Device’s second choice for voice coder/decoder. Select None if
you only want the ZyXEL Device to accept the first choice.
Third
Compression
Type
This field is disabled if Secondary Compression Type is None.
Select the ZyXEL Device’s third choice for voice coder/decoder. Select None if
you only want the ZyXEL Device to accept the first or second choice.